> You'll definitely want to memorize the password to the backup service that has the last copy of your password vault after a disaster. :P

Why? Write it down. Perhaps leave multiple paper copies around with some trusted people, like your lawyer and a safe deposit box at your bank.

Your proposed device seems a bit complicated. You can get pretty far with a piece of paper and this protocol:

Construct your password from two parts. (1) random gibberish you write down on paper, (2) a 'correct horse battery staple'-style part that you memorise.

Btw, have you looked into Yubikeys? They are better than password storage, because they can store your private keys and do signing with them. The key never leaves the device. (They can also store passwords, I think.)

> Why? Write it down. Perhaps leave multiple paper copies around with some trusted people, like your lawyer and a safe deposit box at your bank.

Those people would then effectively have access to your nearly-current desktop/laptop data from anywhere, especially since they would have to know who you are which greatly simplifies guessing your username/email.

> You can get pretty far with a piece of paper

Password Papers (A) never get backed-up, meaning they'll be locked out of basically everything if the house burns down and (B) I've already tried getting relatives using them to adopt exactly such a fixed+variable combo scheme.

> Why? Write it down. Perhaps leave multiple paper copies around with some trusted people, like your lawyer and a safe deposit box at your bank.

Those people would then effectively have access to your nearly-current desktop/laptop data from anywhere, especially since they would have to know who you are which greatly simplifies guessing your username/email.

> You can get pretty far with a piece of paper

Password Papers (A) never get backed-up and (B) I've already tried getting relatives using them to adopt exactly such a fixed+variable combo scheme.